Chemical apparatus and process disinfecting – deodorizing – preser – Analyzer – structured indicator – or manipulative laboratory... – Means for analyzing gas sample
Patent
1994-10-11
1997-09-09
Le, Long V.
Chemical apparatus and process disinfecting, deodorizing, preser
Analyzer, structured indicator, or manipulative laboratory...
Means for analyzing gas sample
422 83, 422 88, 436161, 95102, 73 2341, 73 2335, 7386311, 7386312, G01N 3002, B01D 5302
Patent
active
056653140
ABSTRACT:
Sample analysis in a portable analytical instrument, preferably in the form of a gas chromatograph, benefits from temperature control of one or more zones in the instrument by way of thermal energy developed from an energy reservoir. In a preferred embodiment, analytical instrument performs chromatographic analysis and the selected zone comprises a temperature-controlled thermal chamber, or oven (124) which includes a heating unit (118), a temperature sensor (128), and a cooling unit (130). A separation column column (118) is positioned within the oven (124). The energy reservoir comprises a first reservoir (125) of heating fluid in the form of a compressed light hydrocarbon, a second reservoir (126) of a compressed inert gas, or a combination thereof. A controlled temperature in the oven (124) resulting from the operation of the heating unit (118) and/or cooling unit (130) may be effected in response to a control signal generated by a computer (122). A sample mixture passing through the column (118) is thereby exposed to a desired temperature profile according to a selected program so that the sample (111) will separate into its components for subsequent detection by a detector (124).
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Berger Terry A.
Nickerson Mark A.
Dudley Mark Z.
Hewlett--Packard Company
Le Long V.
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